Embedded content loaded from third-party domains (for example, YouTube, Google Analytics, ad networks, or CDNs) may also be affected. You can test this by loading the web page in question in a browser with HTTPS Everywhere installed and pulling down the HTTPS Everywhere rules menu. This will show a list of HTTPS Everywhere rules that were applied as the page was loaded, including rules that might have affected embedded content from other domains.

The stable (as yet unreleased) branch contains the following rule that is enabled by default:

The HTTPS Everywhere developers welcome corrections and updates to rules. Please see our
developer information
and documentation of the
ruleset format. If filing a bug in the Tor Project's Trac bug tracker, you can use
the shared username and password cypherpunks / writecode; please ensure
that the bug is marked as applying to HTTPS Everywhere.